PassatR

I think I'm going to buy one of these for my 2019 passat... is there any noticeable difference with the different part numbers, or are they all basically the same?

I've just bought my 2019 B8 estate, but the audio is pretty rubbish! So I'm looking for an upgrade and this helix system seems like it might tick the boxes. Am I right in thinking that if I keep the spare wheel, and put the sub on top, the boot floor won't sit flat? (Even in the high position?). Does anyone have any pictures of how the floor would sit? @SpursMadDave I think I saw a post saying you're in Dartford? I'm in Swanley... If you have the helix installed would you mind if I come and have a listen? Cheers! Joe